I went out to shoot the moon tonight, because it was a "supermoon" -- the closest full moon we get each year as the moon reaches its perigee -- and it was very clear tonight from Vancouver. I shot this with my 500mm Tamron f/8 SP macro lens and a 1.6x extender, and the lens didn't even attach properly to my camera because it was an old mount for my old Yashica. I haven't used it ever with my 5D yet, and that's why. But it was worth trying tonight anyway, and it worked. I just held it up to the camera body and shot. I shot it at ISO 200 and 1/200 sec. I don't know the f-stop (the camera said f/0, probably because I didn't have the lens mounted so it couldn't communicate with the lens). I used a tripod and self-timer to minimize shake. I was actually able to leave the lens kind of "hanging" off the camera body since the body was aimed up towards the moon and gravity held the lens on with no light leaking in. That was lucky, as it was impossible for me to hold the lens still enough with my hand at that shutter speed and focal length.